parse: Tweak the function parameter edition check
Follow-up to https://github.com/rust-lang/rust/pull/69801.
Edition of a code fragment is inferred from "the place where the code is written".
For individual tokens like edition-specific keywords it may be the span of the token itself ("uninterpolated" span), but for larger code fragments it's probably not, in the test example the trait method is obviously written in "2015 edition code".
r? @Centril
Exhaustiveness checking, `Matrix::push`: recursively expand or-patterns
> There's an implicit invariant that there should be no or-patterns directly in the first column of the matrix, but this invariant is broken exactly when an or-pattern has a child that is itself an or-pattern.
Here we preserve this broken invariant by recursively expanding `PatKind::Or`s in `Matrix::push`.
Fixes https://github.com/rust-lang/rust/issues/69875.
r? @varkor
cc @Nadrieril
cc https://github.com/rust-lang/rust/issues/54883
make `mem::discriminant` const
implements #69821, which could be used as a tracking issue for `const_discriminant`.
Should this be added to the meta tracking issue #57563?
@Lokathor
Use TypeRelating for instantiating query responses
`eq` can add constraints to `RegionConstraintData`, which isn't allowed during borrow checking outside of a `CustomTypeOp`. Use `TypeRelating` instead to always push constraints to the obligations list.
closes#69490
Stabilize const for integer {to,from}_{be,le,ne}_bytes methods
All of these functions can be implemented simply and naturally as const functions, e.g. `u32::from_le_bytes` can be implemented as
```rust
(bytes[0] as u32)
| (bytes[1] as u32) << 8
| (bytes[2] as u32) << 16
| (bytes[3] as u32) << 24
```
So stabilizing the constness will not expose that internally they are implemented using transmute which is not const in stable.
Cleanup `rmeta::MacroDef`
Avoid using rountrip parsing in the encoder and in `fn load_macro_untracked`.
The main reason I was interested in this was to remove `rustc_parse` as a dependency of `rustc_metadata` but it seems like this had other benefits as well.
Fixes#49511.
r? @eddyb
cc @matthewjasper @estebank @petrochenkov
Remove spotlight
I had a few comments saying that this feature was at best misunderstood or not even used so I decided to organize a poll about on [twitter](https://twitter.com/imperioworld_/status/1232769353503956994). After 87 votes, the result is very clear: it's not useful. Considering the amount of code we have just to run it, I think it's definitely worth it to remove it.
r? @kinnison
cc @ollie27
unix: Don't override existing SIGSEGV/BUS handlers
Although `stack_overflow::init` runs very early in the process, even
before `main`, there may already be signal handlers installed for things
like the address sanitizer. In that case, just leave it alone, and don't
bother trying to allocate our own signal stacks either.
Fixes#69524.
Permit attributes on 'if' expressions
Previously, attributes on 'if' expressions (e.g. `#[attr] if true {}`)
were disallowed during parsing. This made it impossible for macros to
perform any custom handling of such attributes (e.g. stripping them
away), since a compilation error would be emitted before they ever had a
chance to run.
This PR permits attributes on 'if' expressions ('if-attrs' from here on).
Both built-in attributes (e.g. `#[allow]`, `#[cfg]`) and proc-macro attributes are supported.
We still do *not* accept attributes on 'other parts' of an if-else
chain. That is, the following code snippet still fails to parse:
```rust
if true {} #[attr] else if false {} else #[attr] if false {} #[attr]
else {}
```
Closes https://github.com/rust-lang/rust/issues/68618
Although `stack_overflow::init` runs very early in the process, even
before `main`, there may already be signal handlers installed for things
like the address sanitizer. In that case, just leave it alone, and don't
bother trying to allocate our own signal stacks either.
Compile address sanitizer test with debuginfo
This makes error-pattern to match regardless of current
configuration of `rust.debuginfo-level-tests` in `config.toml`.
Change DIBuilderCreateEnumerator signature to match LLVM 9
* Change DIBuilderCreateEnumerator signature to match LLVM 9 C API.
* Use provided is unsigned flag when emitting enumerators.
Miri visitor: detect primitive types based on type, not layout (also, more tests)
I also converted the union-based transmutes to use `mem::transmute` for increased readability.
r? @eddyb @oli-obk
check_binding_alt_eq_ty: improve precision wrt. `if let`
Follow up to https://github.com/rust-lang/rust/pull/69452 -- this tweaks the `check_binding_alt_eq_ty` logic wrt. wording so that `if let` doesn't include "in this arm" (because there can only ever be one arm).
r? @estebank
